1. [1] Roberts, T. G. Popular orbits 101.CSIS Aerospace Security (2017). https://aerospace.csis.org/aerospace101/popular-orbits-101/.
2. [2] NASA. NASA ODPO’s large constellation study. Orbital Debris Quarterly News 22 (2018). https://www.orbitaldebris.jsc.nasa.gov/quarterly-news/pdfs/odqnv22i3.pdf.
3. [3] Flewelling, B., Ingram, C. & Cunio, P. M. Formation flying as formalism for space traffic management. AIAA SciTech Forum (2020). https://doi.org/10.2514/6.2020-0236.
4. [4] Weeden, B. Iridium-Cosmos collision factsheet. Secure World Foundation (2010). https://swfound.org/media/6575/swf_iridium_cosmos_collision_fact_sheet_updated_2012.pdf.
5. [5] Schaffer, A. The role of space norms in protection and defense. Joint Forces Quarterly 87 (2017). https://ndupress.ndu.edu/Portals/68/Documents/jfq/jfq-87/jfq-87_88-92_Schaffer.pdf?ver=2017-09-28-092555-747.